Mass Spectrometry and HyMETS Testing Reveal Spallation Mechanisms in Thermal Protection Systems

This research investigates the spallation mechanisms of Thermal Protection Systems (TPS) using mass spectrometry and HyMETS testing. The study identifies a quantitative link between chemical decomposition and mechanical response, which is crucial for predicting material instability. The process involves initial heating, which releases absorbed water and can cause localized stresses. As heating continues, pyrolysis occurs, leading to rapid pressure buildup. If the internal pressure exceeds the material's strength, spallation occurs. These findings highlight the interplay between volatile release, pyrolysis gas evolution, and stress generation, all of which govern TPS material stability under entry conditions. Understanding these mechanisms is essential for enhancing the durability and reliability of TPS materials, which are critical for spacecraft safety during atmospheric entry. Further research and improved modeling techniques are needed to accurately simulate these complex processes and prevent premature TPS failure. This research contributes to the broader field of materials science and engineering, with potential applications beyond aerospace, such as in high-temperature coatings and structural materials.

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